1800-1865 - “Birth & Development Era”
• Horatio Allen
• Matthias Baldwin
• Peter Cooper
• Stephen A. Douglas
• William W. Gordon
• Herman Haupt
• Abraham Lincoln
• Charles Minot
• William B. Ogden
• George Pullman
• Col. John Stevens

1866-1945 - “Golden Era”
• Peter M. Arthur
• Andrew Jackson Beard
• Major General Grenville Mellen Dodge
• Henry M. Flagler
• Sandford Fleming
• Edward H. Harriman
• James J. Hill
• Cyrus K. Holliday
• Elijah McCoy
• J. P. Morgan
• City of Nashville & West Nashville
• Willard Townsend
• Cornelius Vanderbilt
• George Westinghouse

1946-Present - “Modern Era”
• John W. Barriger, III.
• Max & Thelma Biegert
• Ralph Budd
• W. Graham Claytor, Jr.
• Leo Stanley Crane
• Mike Haverty
• Jervis Langdon, Jr.
• Louis W. Menk
• Paul M. Tellier